debugger/src/main/java/org/apache/pdfbox/debugger/ui/DebugLogAppender.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.pdfbox.debugger.ui;

import java.io.Serializable;

import org.apache.logging.log4j.core.appender.AbstractAppender;
import org.apache.logging.log4j.core.appender.ConsoleAppender;
import org.apache.logging.log4j.core.config.Configurator;
import org.apache.logging.log4j.core.config.builder.impl.BuiltConfiguration;
import org.apache.logging.log4j.core.config.plugins.Plugin;
import org.apache.logging.log4j.core.config.plugins.PluginAttribute;
import org.apache.logging.log4j.core.config.plugins.PluginElement;
import org.apache.logging.log4j.core.config.plugins.PluginFactory;
import org.apache.logging.log4j.Level;
import org.apache.logging.log4j.core.Filter;
import org.apache.logging.log4j.core.Layout;
import org.apache.logging.log4j.core.LogEvent;
import org.apache.logging.log4j.core.config.Property;
import org.apache.logging.log4j.core.config.builder.api.AppenderComponentBuilder;
import org.apache.logging.log4j.core.config.builder.api.ConfigurationBuilder;
import org.apache.logging.log4j.core.config.builder.api.ConfigurationBuilderFactory;

@Plugin(name = "DebugLogAppender", category = "Core", elementType = "appender", printObject = true)
public class DebugLogAppender extends AbstractAppender
{
    protected DebugLogAppender(String name, Filter filter, Layout<? extends Serializable> layout,
            final boolean ignoreExceptions)
    {
        super(name, filter, layout, ignoreExceptions, Property.EMPTY_ARRAY);
    }

    @PluginFactory
    public static DebugLogAppender createAppender(@PluginAttribute("name") String name,
            @PluginElement("Filter") Filter filter,
            @PluginElement("Layout") Layout<? extends Serializable> layout,
            @PluginAttribute("ignoreExceptions") boolean ignoreExceptions) {
        return new DebugLogAppender(name, filter, layout, ignoreExceptions);
    }

    @Override
    public void append(LogEvent event)
    {
        // forward to your logging dialog box here.
        LogDialog.instance().log(event.getLoggerName(), event.getLevel().name(),
                event.getMessage().getFormattedMessage(), event.getThrown());
    }

    public static void setupCustomLogger()
    {
        ConfigurationBuilder<BuiltConfiguration> builder = ConfigurationBuilderFactory
                .newConfigurationBuilder();

        AppenderComponentBuilder appenderBuilder = builder.newAppender("Custom", "DebugLogAppender");
        appenderBuilder.add(builder.newLayout("PatternLayout").addAttribute("pattern",
                "%d [%t] %-5level: %msg%n%throwable"));
        builder.add(appenderBuilder);

        builder.add(builder.newRootLogger(Level.INFO).add(builder.newAppenderRef("Custom")));
        Configurator.initialize(builder.build());
    }
}